Grinding attachment



y- 1945- c. MELIDONI ETAL GRINDING ATTACHMENT Filed Apri1 l9, 1945 3 Sheets-Sheet l CON STANTINE, MELIDOINI HAROLD BASS INVENTORS ATTORNEY M y ,1946. c. MEUDQNI'E'TAL 2 400,7 7

GRINDING ATTACHMENT Filed April 19, 1945 3 Sheets-Sheet 2 CONSTANTINE MELlDbNI 1/. HAROLD M55 1 INVENTORS BYW M ATTORNEY y 1946. c. MELlDONl JEliAL 2,

. GRINDING ATTACHMENT I Filed ApriI 19, 1945 s Sheets-Sheet s L o o o I Y O i 43 42 43 4 CONSTANTINE MELIDONJ T; HAROLD BASS I 119$ u INVENTORSI ATTORNEY BYWM Patented May 21, 1946 GRINDING ATTACHMENT Constantine Melidoni and Harold Gass, New

York, N. Y., assignors to Van Norman Company, Springfield, Mass., a corporation of Massachusetts Application April 19, 1945, Serial No. 589,148 7 Claims. (Cl. 51-231) This invention relates to an attachment for grinding machines whereby cylinder heads of engines and the like are ground or resurfaced.

An object of this invention is to provide a selfcontained grinding attachment which may be mounted as a unit on a grinding machin table, the said attachment comprising a stationary frame having two fixed and spaced-apart guideways and a pinion gear and handwheel rotatably supported thereon.

Another object of this invention is to provide a slidable frame mounted on the stationary frame, the slidable frame having a rack gear in meshed engagement with the pinion gear and being reciprocable relative to the stationary frame by rotation of the handwhcel andpinion gear. Another object of this invention is to provide a gripping frame fixedly attachable in alinement with the slidable frame and having four jaws pivotally mounted thereon, the said jaws extending below the gripping fram and being adapted to be moved into clamping engagement with a cylinder head lying upon the table of the grind ing machine.

Another object of this invention is to provide dowel pins in the slidable frame and means whereby the dowel pins may be placed in engagement with the gripping frame so as to cause the gripping frame to be movable as a unit with the cylinder head while supported by the stationary frame.

Another object of this invention is to provide a two-part detachable hinge, the said hinge having one part fixed to the slidable frame and the other part fixed to the stationary frame, the two hinge parts being so disposed asto permit slidable engagement with each other after disengagement of the dowel pins, the hinge serving to swing the gripping frame jointly with a cylinder head from the table of the grinding machine to a substantially vertical position at one side of the slidable frame and so as to make the ground surface visible to the operator whereby the operator can easily determine as to the necessity of taking a further out on the cylinder head.

With the above and other objects in view, the

' invention will be hereinafter more particularly described, and. the combination and arrangement of parts will be shown in the accompanying drawings and pointed out in the claims which form part of this specification.

Reference will now be had to the drawings, wherein like numerals of reference designate corresponding parts throughout the several views, in

which:

Figure 1 is a plan view of the grinding attachment mounted on the table of a grinding machine.

Figure 2 is an end view of the grinding attachment in operative position.

Figure 3 is an end view, the same as shown in Figure 2, with the gripping frame swung into vertical position.

Figure 4 is a cross-sectional view, the section being taken as on line 44 in Figure 3.

Figure 5 is a cross-sectional view, the section being taken as on line 5--5 in Figure 4, and showing arms for aligning the gripping and slidable frames.

' In the illustrated embodiment of the invention, the numeral l0 indicates a self-contained grinding attachment comprising a rectangular frame 'I l by means of which the attachment is fixed to the upper surface or table l2 of a grindingmachine I3. a

The grinding machine has a horizontally positioned grinding wheel [4 secured to a vertically movable shaft I5. By adjusting the shaft 15, the grinding wheel is brought upwardly into grinding relation with-the lower surface of a cylinder head 16 lying upon the table l2. 7

In accordance with present practice in the art, a cylinderhead to be resurfaced by grinding its lower face is placed upon the grinding table [2 and held against the grinding Wheel l4 merely due to the weight of the cylinder head and it is impossible to take a grinding cut of more than one thousandth of an inch.

With the clamping and holding attachment herein disclosed it is possible to take a grinding cut of one-sixty-fourth of an inch in one operation and accordingly the rate of production is about five times a great as heretofore. Additionally, with the use of the grinding attachment Hi, the grinding is perfectly uniform and performed with precision, which was not possible heretofore. The grinding machine [3 is well known in the art and not part of the present invention and accordingly needs no further description.

The fixed frame ll comprises elongated horizontal bars or base members l1, I1, having vertical end portions or aprons l8, l8, which extend downwardly below the table I2. Bars l9, having guideways 2!] are fastened to the base members ll. The guideways face each other.

A slidable rectangular frame 2| is mounted on the fixed frame H. Theframe 2| has two, side walls 23 extending lengthwise and two side walls 24, which extend crosswise of the fixed frame H. The frame 2| has slide bars 25 fixed to its lengthwise side walls 23. The slide bars 25 fit into the guideways 20 in slidable relation. A rack gear 25 is suitably fixed to one of the slide bars 25 in any suitable way such as. by welding. V

A bearing 21 is fixed to an extension 28 of the fixed frame I I and supports a shaft 29. A pinion gear 38 is fixed at one end of the shaft 29 and is in meshed engagement with the rack gear 26. A handwheel 3! is fixed to the outer end of the shaft 29. By rotating the handwheel, the pinion gear 35 reciprocates the rack gear 26 and the frame 2|.

A rectangular gripping frame 35 having a width slightly larger than the width of the slidable frame 2|, is supported upon the slidable frame. The transverse sides 36 of the gripping frame 35 have through apertures 31 at each end thereof. Four pivotal gripping jaws 38 have pin extensions 39 mounted .in the apertures 31.

Bolts 49 threaded in the lengthwise walls of the gripping frame and positioned in alignment with the gripping jaws 38 serve for moving the jaws into clamping engagement with the cylinder head 16 lying upon the table l2.

In practice, the distance between the bolts 40 and the pin extensions 39 is made co ;siderable so as to provide leverage to augment the gripping power of the jaws against the cylinder head.

The slidable frame 2! has outwardly projecting dowel pins ll. The dowel pins are adapted to be brought into engagement with openings 42 in aligning arms 43 which are fixed to the grippin frame 35. This engagement causes the slidable frame and the gripping frame to come into unitary relation.

Fixed to the rear surface of one of the lengthwise sides 23 of the slidable frame 2!, is a hinge element 55 having an elongated aperture 65. Fixed to the rear wall of the gripping frame 35 is a co-acting hinge element 41 having a pintle 45 positioned in alignment with the aperture it in the hinge element 45.

Under practical operating conditions, or in dowel pin engaging position, the hinge element 45 is considerably spaced from the pintle 38 to permit sliding movement of the gripping frame to'first disengage the gripping frame from the dowel pins and thereby release the gripping frame from engagement with the slidable frame.

Further sliding movement of the gripping frame causes the pintle 48 to come into engagement with the co-acting aperture 46 in the hinge element 45. In this position, the hinge elements are in engagement and it is possible to swing the gripping frame 35 jointly with the cylinder head 6 to a position rearward of the slidable frame 2|, and in which position the cylinder head assumes a substantially vertical position which permits the operator to easily examine the ground surface of the cylinder head and to determine whether a further regrinding is necessary.

It is to be noted that bolts 50 are threaded in the corner portions of the gripping frame 35 and are respectively positioned in alignment with the midportion of the side walls 23 to bringthe frames El and 35 into fixed relation.

After a grinding operation is completed, the operator loosens the bolts 50. He is then in a position to move the gripping frame away from the dowel pins 4! and to swing the gripping frame 35 upon the hinge and bring the ground surface of the cylinder head into perpendicular relation with the table 12 of the grinding machine. If the operator finds further grinding necessary, he swings the gripping frame 35 with the attached cylinder head back into grinding position. The operator then raises the grinding wheel l4 slightly above the previous grinding level and repeats the operation of grinding the cylinder head. The operator then swings the cylinder head again to the rear of the slidable frame and re-examines the ground surface. The ground cylinder head or any other article requiring grinding is in supported relation while being inspected.

, If he finds the ground surface to be properly ground he again lowers the gripping frame 35 into engagement with the slidable frame 2 I. The operator then moves the gripping frame 35 away from engagement with the dowel pins 4i and causes the gripping frame to become clear of interlocking engagement with the slidable frame 2 1. He is then in a position to remove the ground cylinder head from the grinding machine.

For the purpose of taking care of cylinder heads of different sizes we haveprovided a p-luraiity of spaced-apart apertures 31 at each end of the transverse sides 36 of the gripping frame 35. This arrangement permits the operator to pivotally mount the gripping jaws 33 selectively in either of the apertures 31, whichever suits the particular cylinder head to be ground.

It is further to be noted that the pintle 48 of the hinge M is slightly bevelled at its free outer end and that the elongated aperture 46 in the hinge element 45 has a bevelled end portion. These bevelled portions facilitate the engagement of the hinge elements without the necessity of looking for the proper position so as to engage the complementary hinge element.

It is also to be noted that the aligning arms 33 are in close fitting relation with the outer faces of the slidable frame 2i and that this causes the interengagement of the hinge parts to take place automatically.

As best shown in Figure 4, it will be seen that rectangular openings 5| are provided in the side walls 23 of the slidable frame. 2|, to permit the aligning arms is to clear the rear wall 23 when the gripping frame 35 is swung into vertical position for the inspection of the ground cylinder head, etc.

As best shown in Figure 5, it will be seen that the aligning arms 43 have their openings i2 of a size adapted to receive the dowel pins M for securing the gripping frame and slidable frame in unitary relation.

In accordance with the patent statutes we have described and illustrated the preferred embodiment of our invention, but it will be understood that various changes and modifications can be made therein without departing from the spirit of the invention as defined by the appended claims.

We claim;

1. A grinding attachment comprising a stationary frame having two fixed and spaced-apart guideways, said stationary frame being adapted for mounting on the table of a grinding machine, a frame slidable on said stationary frame, said frames having gear means whereby aid slidable frame may be reciprocated in relation to said stationary frame, a gripping frame fixedly attachable in alignment with said slidable frame and having a plurality of jaws pivotally mounted thereon, said jaws extendin below said gripping frame and being adapted to be moved into gripping engagement with a cylinder head lying upon saidtable, and two-part detachable hinge means respectively fixed to said slidable frame and to said stationary frame to permit swinging of said gripping frame jointly with said cylinder head from said table to a substantially vertical position into full visibility for inspection.

2. A grinding attachment comprising a stationary frame having two fixed and spaced-apart guideways, said stationary frame being adapted for mounting on the table of a grinding machine, a frame having slides fitting in said guideways and being thereby slidable on said stationary frame, said frames having gear means whereby said slidable frame may be reciprocated in relation to said stationary frame, a gripping frame fixedly attachable in alignment with said slidable frame and having a plurality of jaws pivotally mounted thereon, said jaws extending below said gripping frame, means for moving said jaws into gripping engagement with a cylinder head lying upon said table, and two-part detachable hinge means respectively fixed to said slidable frame and to said gripping frame to permit swinging of said gripping frame jointly with said cylinder head from said table to a substantially vertical position into full visibility for inspection.

3. In a grinding attachment comprising a stationary frame having two fixed and spacedapart guideways, said stationary frame being adapted for mounting on the table of a grinding machine, a frame having slides fitting in said guideways and being thereby slidable on said stationary frame, said frames having gear means whereby said slidable frame may be reciprocated in relation to said stationary frame, a gripping frame fixedly attachable in alignment with said slidable frame and having a plurality of jaws pivotally connected at their upper ends to the gripping frame to swing inwardly therein, said jaws extending below said gripping frame and means threaded through the sides of the gripping frame to engage the outer faces of the jaws at a point substantially below theirpivots for moving said jaws into grippingengagement with a cylinder head lying upon said table. v

4. In a grinding attachment comprising a stationary frame having two fixed and spaced-apart guideways, said stationary frame having aprons extending downwardly below said guideways and being adapted for mounting on the table of a grinding machine, an elongated frame having slides fitting in said guideways and being slidable on said stationary frame over said aprons and beyond the ends of said table, said frames having co-acting gear means whereby said slidable frame may be reciprocated in relation to said stationary frame, a gripping frame fixedly attachable in alignment with said slidable frame and having a plurality of gripping jaws pivotally mounted thereon, said jaws extending below said gripping frame and means threaded through the sides of the gripping frame and engaging the outer faces of the jaws at points substantially spaced from their pivots for moving said jaws into gripping engagement with a cylinder head lying upon said table.

5. In a grinding attachment comprising a stationary frame having two fixed guideways, said stationary frame having aprons extending downwardly below said guideways and being adapted for mounting on the table of a grinding machine, an elongated frame having slides fitting in said guideways and being slidable on said stationary frame over said aprons and beyond the ends of said table, said frames having co-acting gear means whereby said slidable'frame may be reciprocated in relation to said stationary frame, a

gripping frame fixedly attachable on said slidable frame and having a plurality of gripping jaws pivotally mounted thereon, said jaws extending below said gripping frame, threaded means in said gripping frame for moving said jaws into gripping engagement with an article to be ground, and means for swinging said article for inspection while in supported relation,

6. In a grinding attachment comprising a sta tionary frame having two fixed guideways, said stationary frame having aprons extending downwardly below said guideways and being adapted for mounting on the table of a grinding machine, an elongated frame having slides fitting in said guideways and being slidable on said stationary frame over said aprons and beyond the ends of said table, said frames having co-acting gear means whereby said slidable frame may be reciprocated in relation to said stationary frame, a gripping frame fixedly attachable on said slidable frame and having a plurality of gripping jaws pivotally mounted thereon, said jaws extending below'said gripping frame, threaded means in said gripping frame for moving said jaws into gripping engagement with an article to be ground, said slidable frame having a hingeelement, said gripping frame having a hinge element co-acting with said hinge element on said slidable frame for swinging said article for inspection while in supported relation.

CONSTANTINE MELIDON I. HAROLD GASS. 

